def callFromThread(self, f, *args, **kw):
assert callable(f), "%s is not callable" % f
with NullContext():
# This NullContext is mainly for an edge case when running
# TwistedIOLoop on top of a TornadoReactor.
# TwistedIOLoop.add_callback uses reactor.callFromThread and
# should not pick up additional StackContexts along the way.
self._io_loop.add_callback(f, *args, **kw)
def test_exception_logging(self):
"""Uncaught exceptions get logged by the IOLoop."""
# Use a NullContext to keep the exception from being caught by
# AsyncTestCase.
with NullContext():
self.io_loop.add_callback(lambda: 1 / 0)
self.io_loop.add_callback(self.stop)
with ExpectLog(app_log, "Exception in callback"):
self.wait()
def make_wrapped_function():
"""Wraps a function in three stack contexts, and returns
the function along with the deactivation functions.
"""
# Remove the test's stack context to make sure we can cover
# the case where the last context is deactivated.
with NullContext():
partial = functools.partial
with StackContext(partial(self.context, 'c0')) as c0:
with StackContext(partial(self.context, 'c1')) as c1:
with StackContext(partial(self.context, 'c2')) as c2:
return (wrap(check_contexts), [c0, c1, c2])
def test_exception_logging_native_coro(self):
"""The IOLoop examines exceptions from awaitables and logs them."""
namespace = exec_test(
globals(), locals(), """
async def callback():
self.io_loop.add_callback(self.stop)
1 / 0
""")
with NullContext():
self.io_loop.add_callback(namespace["callback"])
with ExpectLog(app_log, "Exception in callback"):
self.wait()
def test_exception_logging_future(self):
"""The IOLoop examines exceptions from Futures and logs them."""
with NullContext():
@gen.coroutine
def callback():
self.io_loop.add_callback(self.stop)
1 / 0
self.io_loop.add_callback(callback)
with ExpectLog(app_log, "Exception in callback"):
self.wait()
def test_handle_callback_exception(self):
# IOLoop.handle_callback_exception can be overridden to catch
# exceptions in callbacks.
def handle_callback_exception(callback):
self.assertIs(sys.exc_info()[0], ZeroDivisionError)
self.stop()
self.io_loop.handle_callback_exception = handle_callback_exception
with NullContext():
# remove the test StackContext that would see this uncaught
# exception as a test failure.
self.io_loop.add_callback(lambda: 1 / 0)
self.wait()
def addWriter(self, writer):
if writer in self._writers:
return
fd = writer.fileno()
self._writers[writer] = fd
if fd in self._fds:
(reader, _) = self._fds[fd]
self._fds[fd] = (reader, writer)
if reader:
# We already registered this fd for read events,
# update it for write events as well.
self._io_loop.update_handler(fd, IOLoop.READ | IOLoop.WRITE)
else:
with NullContext():
self._fds[fd] = (None, writer)
self._io_loop.add_handler(fd, self._invoke_callback,
IOLoop.WRITE)
def test_read_callback_error(self):
# Test that IOStream sets its exc_info when a read callback throws
server, client = self.make_iostream_pair()
try:
server.set_close_callback(self.stop)
with ExpectLog(
app_log, "(Uncaught exception|Exception in callback)"
):
# Clear ExceptionStackContext so IOStream catches error
with NullContext():
server.read_bytes(1, callback=lambda data: 1 / 0)
client.write(b"1")
self.wait()
self.assertTrue(isinstance(server.error, ZeroDivisionError))
finally:
server.close()
client.close()
def addReader(self, reader):
if reader in self._readers:
# Don't add the reader if it's already there
return
fd = reader.fileno()
self._readers[reader] = fd
if fd in self._fds:
(_, writer) = self._fds[fd]
self._fds[fd] = (reader, writer)
if writer:
# We already registered this fd for write events,
# update it for read events as well.
self._io_loop.update_handler(fd, IOLoop.READ | IOLoop.WRITE)
else:
with NullContext():
self._fds[fd] = (reader, None)
self._io_loop.add_handler(fd, self._invoke_callback,
IOLoop.READ)
def test_final_callback_stack_context(self):
# The final callback should be run outside of the httpclient's
# stack_context. We want to ensure that there is not stack_context
# between the user's callback and the IOLoop, so monkey-patch
# IOLoop.handle_callback_exception and disable the test harness's
# context with a NullContext.
# Note that this does not apply to secondary callbacks (header
# and streaming_callback), as errors there must be seen as errors
# by the http client so it can clean up the connection.
exc_info = []
def handle_callback_exception(callback):
exc_info.append(sys.exc_info())
self.stop()
self.io_loop.handle_callback_exception = handle_callback_exception
with NullContext():
self.http_client.fetch(self.get_url('/hello'),
lambda response: 1 / 0)
self.wait()
self.assertEqual(exc_info[0][0], ZeroDivisionError)
def f1():
with NullContext():
wrapped = wrap(f2)
with StackContext(functools.partial(self.context, 'c2')):
wrapped()